Who wins?
Arm under the pillow vs Right side
Right side wins 76% to 24%. 15 more put them in the same row. From Sleep Positions Tier List. Pick a side.
SoggyLlama on Arm under the pillow: the cool pillow side keeps it worth it
wet_taco_8734 on Right side: no difference, sleep how you want
Sleep Positions Tier List: the full ranking